Linux expansion commands

Hey guys. Linux noob here. Question: I am reading the Linux Command Line and just encountered expansion commands. I understand that the $ prefix to let's say USER is variable, but I'm not exactly understanding their purpose. Anyone have a handy explanation?

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UnixGuy

If I understand your question correctly, this can be used to define variables for script.

eg:

# export UnixGuy="hi"
# echo $UnixGuy

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